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Seiko SNK381 with 7S26-01V0 movement. In 1968, Seiko introduced three ten beat (ten ticks per second) calibers, the automatic caliber 61GS, the manual winding 45GS [46] and 19GS [47] for women's watch. The 61GS was Japan's first automatic ten beat watch, and it was the most accurate mechanical watch due to the high beat calibers. [48]
Quartz Movement of the Seiko Astron, 1969 (Deutsches Uhrenmuseum, Inv. Inv. 2010-006) The Astron wristwatch, formally known as the Seiko Quartz-Astron 35SQ, was the world's first "quartz clock" wristwatch. It is now registered on the List of IEEE Milestones as a key advance in electrical engineering.
The watches had an average monthly rate of ±15 sec and provided 75 hours of continuous operation when fully powered. Early automatic quartz movements were called AGS (Automatic Generating System). In 1991 the company introduced the Kinetic brand name. [4] Today Seiko offers a wide range of watches with various Kinetic movements.
The Models 21 and 22 had a two-day power reserve and the movements of both were marked "U.S. Navy Bureau of Ships". The Model 22 was also used by the U.S. Army, and on the back of some, it is marked "U.S. Army", but all the Model 22 movements are marked "U.S. Navy Bureau of Ships". The Model 23 was a 16-size chronograph pocket watch.
This list is a duplicate of Category:Watch brands, which will likely be more up-to-date and complete. Manufacturers that are named after the founder are sorted by surname. Names in this list require an article about the watch brand or watchmaker
Quartz Movement of the Seiko Astron, 1969 (Deutsches Uhrenmuseum, Inv. 2010-006) The first quartz watch to enter production was the Seiko 35 SQ Astron , which hit the shelves on 25 December 1969, swiftly followed by the Swiss Beta 21, and then a year later the prototype of one of the world's most accurate wristwatches to date: the Omega Marine ...